Add support for MacOS

[mattbates]

Adds an implementation for Darwin and uses build flags.

[gemini-code-assist]

Summary of Changes

Hello @mattbates, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the spire-devserver package by enabling compatibility with MacOS. It achieves this by refactoring the core logic responsible for obtaining caller information (PID, UID, GID, and binary name) during gRPC handshakes, moving away from Linux-specific system calls to a more generalized approach. This change ensures that the server can correctly identify peer processes across different operating systems, alongside a routine update to a Go system-level dependency.

Highlights

• MacOS Support: The pull request introduces support for MacOS by refactoring the peer credential retrieval logic to be platform-agnostic.
• Platform-Agnostic Credential Retrieval: The Linux-specific syscall.GetsockoptUcred and /proc file system reading have been replaced with a new getCallerInfo function, abstracting the process for different operating systems.
• Dependency Update: The golang.org/x/sys dependency has been updated from v0.35.0 to v0.38.0.

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[gemini-code-assist]

Code Review

This pull request refactors the gRPC server handshake logic to support multiple operating systems by abstracting platform-specific code into a getCallerInfo function. This is a good architectural choice for adding macOS support. However, the pull request is incomplete as it omits the implementation of this new function, which will cause a compilation failure. The update to the golang.org/x/sys dependency is also noted and seems appropriate for this kind of change.

[mattbates]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces support for MacOS by adding platform-specific implementations for retrieving caller information (PID, UID, GID, and BinaryName) for Unix domain socket connections. The core grpc-authinfo.go file has been refactored to delegate to these new platform-specific functions, improving modularity and maintainability. Dependency updates in go.mod and go.sum reflect the new libraries required for MacOS support. Overall, the changes are well-structured and achieve the stated goal.

[sd109]

I've been using this locally on my Mac and it works well for me.